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hw/riscv: virt: Add PMU DT node to the device tree

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Qemu virt machine can support few cache events and cycle/instret counters.
It also supports counter overflow for these events.

Add a DT node so that OpenSBI/Linux kernel is aware of the virt machine
capabilities. There are some dummy nodes added for testing as well.

Acked-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Message-Id: <20220824221701.41932-5-atishp@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Atish Patra 2022-08-24 15:17:00 -07:00 • committed by Alistair Francis
parent 892320facd
commit abd9a20665
3 changed files with 74 additions and 0 deletions
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16
hw/riscv/virt.c
View file

@ -30,6 +30,7 @@
#include "hw/char/serial.h"
#include "target/riscv/cpu.h"
#include "hw/core/sysbus-fdt.h"
#include "target/riscv/pmu.h"
#include "hw/riscv/riscv_hart.h"
#include "hw/riscv/virt.h"
#include "hw/riscv/boot.h"
@ -708,6 +709,20 @@ static void create_fdt_socket_aplic(RISCVVirtState *s,
aplic_phandles[socket] = aplic_s_phandle;
}
static void create_fdt_pmu(RISCVVirtState *s)
{
char *pmu_name;
MachineState *mc = MACHINE(s);
RISCVCPU hart = s->soc[0].harts[0];
pmu_name = g_strdup_printf("/soc/pmu");
qemu_fdt_add_subnode(mc->fdt, pmu_name);
qemu_fdt_setprop_string(mc->fdt, pmu_name, "compatible", "riscv,pmu");
riscv_pmu_generate_fdt_node(mc->fdt, hart.cfg.pmu_num, pmu_name);
g_free(pmu_name);
}
static void create_fdt_sockets(RISCVVirtState *s, const MemMapEntry *memmap,
bool is_32_bit, uint32_t *phandle,
uint32_t *irq_mmio_phandle,
@ -1036,6 +1051,7 @@ static void create_fdt(RISCVVirtState *s, const MemMapEntry *memmap,
create_fdt_flash(s, memmap);
create_fdt_fw_cfg(s, memmap);
create_fdt_pmu(s);
update_bootargs:
if (cmdline && *cmdline) {